Riser, Nathan W, et al. <br/><br/>
Biology of the turbellaria 

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 - McGraw-Hill Book Co. Inc., New York  1974 
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<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Flat worms
<br/><br/><label>Dewey Class. No.: </label>592.4  RIS-B